Metal fitting for glass globes



E. H. SCHWAB Dec. 21, 1937.

METAL FITTING FOR GLASS GLOBES Filed May 19, 1934 I v l ltllIlH Illlllll y '....HHH

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Patented Dec. 2l, 17937 i Earl H. Schwab, Pittsburgh, Pa.

Application May 19, 1934, Serial No. 726,506

2 Claims.

This invention relates to new and useful improvements in mountings for light globes and the like and it is among the objects thereof to provide a mounting for engaging the base or neck of globes which shall be adapted to spring or snap onto the globe without the need of machining operations.

A further object of the invention is the provision of means for engaging the seating portion of a globe with a metallic ring in such manner that the ring and globe will be intimately secured and the ring will protect the globev against the strain of the attaching means commonly employed' in the mounting of globes on their supporting base or bracket.

Various means have been provided for fastening protection or mounting rings on globe bases or necks, most of which provide for the clamping of the ring by utilizing split members which can be drawn together by a fastening screw. More recently it has been proposed to apply the ring to the base of the globe by spinning the metal around the globe neck, but this involves expensive machining operations and entails considerable breakage of the globes as it is necessary to subject them to strain when mounting them in position to have the metal spun thereon.

In accordance with the present invention, the metal ring is preformed to the desired shape either by spinning or stamping, and is so designed that it may be sprung on the neck of the globe without necessitating subsequent machining operation, and the ring is designed so thatV the attaching means bearing thereon will not exert any undue strain on the glass body per se.

In the accompanying drawing constituting a part hereof in which like reference characters designate like parts:

Fig. l is a cross-sectional View partially broken away of a glass globe and globe holder embodying the principles of. this invention;

Fig. 2 a cross-sectional View of the globe engaging ring;

' Fig. 3 a cross-section of a portion of a globe illustrating a modied form of neck and ring; and

Fig. 4 a cross-sectional view of still another form of globe mounting.

In the preferred embodiment of the invention, a globe I is designed with concave neck or base 2, this concavity being symmetrical and terminating in cylindrical portions 3 and 4. A ring or ferrule 5, as shown in Fig. 2 of the drawing, is provided with a convex surface 6 terminating in cylindrical portions 1 and 8, the latter being adjacent a flange 9.

The convex portion 6 of the ring 5 is of a larger radii than is the concave surface 2 of the globe so that the metal portion 6 bridges over the shoulders 3 and 4 of the globe as shown in the assembly of Fig. 1.

The ring constructed as shown in Fig'. 2 is sprung on the neck of the globe I by simply in-. serting one edge of the globe in the ring, by tilting it slightly, and then snapping the ring home. A structure of this character is adapted to be mounted in a supporting base Il), havingy fastening screws II Yand a screw thread opening I2 by means of which it is fastened to a standard or support. The metal ring 5 is of lesser diameter than the bracket I so that it can be readily put into position and screws Il are then turned to intimately engage the face 6 of the ring 5 to firmly hold the globe in the bracket.

It will be noted that the strain of the screws I I is exerted in a radial line which, because of the space between the concave surface 2 of the globe neck and the convex portion 6 of the ring, exert no pressure on the glass excepting perhaps a slight pressure which may bear on the cylindrical faces 3 and 4, such pressure being uniformly distributed over a relatively large area of. contact whereby no localized strains are set up in the body of the glass.

In Fig. 3 the neck ring is shown applied to a conventional form of globe I3'having a ared neck portion Ill. In this construction, the ferrule or ring I is provided with a radius I 6 for receiving the bead of the globe and is further provided with a concave surface Il instead of the convex form of Figs. l and 2, the upper edge of the ring terminating in a bead I8. This form of snap ring has a relatively large area of contact with the globe and when sprung in position as shown in Fig. 3 will t the bracket lil in such manner that the attaching means Il will exert a force on the bulged portion of the ring instead of on some portion in direct contact with the glass body.

In the form of construction shown in Fig. 4, the ring I9 is in the shape of an adaptor which has an upper portion with a shoulder for engaging the globe 2I and a lower portion 22 that fits into the bracket I0 in which it is secured by the attaching means H. In this construction as in the structure shown in Figs. 1 and 3, the strain of the attaching means does not act upon the body of the glass so that no detrimental stresses can be set up in the glass which might cause breakage. Breakage commonly occurs when screw parts are securely drawn against the body of the glass at concentrated centers and the metal and glass parts are subjected to expansion differentials due to the differences in the temperature coefficients of metal and glass when they are subjected to temperature changes.

Although several embodiments of the invention have been herein illustrated and described, it will be obvious to those skilled in the art that various modifications may be made in the details of construction Without departing from the principles herein set forth.

I claim:

1. Combination of a globe and adaptor ring therefor comprising a, hollow glass body open at one end having a neck portion at its open end, said neck being provided with a concavity, and a solid continuous metal ring having a convex portion adapted for alinement with the concavity of the globe neck and adapted to be sprung thereon, said ring being of lesser diameter than the globe neck whereby, when said ring is sprung on the globe neck, its seating surfaces Will effect intimate contact, and the convex and concave portions of the ring and globe respectively will form an interlock.

2. An adaptor for glass globes and the like comprising a continuous metal ring having uninterrupted gripping surfaces adapted to intimately engage the neck portion of the globe by being sprung thereon, said ring having an extension of said gripping portion extending beneath the gripping portion and a mounting bracket for receiving the extension of said ring having means for securely engaging the ring therein.

EARL H. SCHWAB. 

